Break-Even Load Factor Analyzer

Enter flight economics parameters. The tool instantly computes break-even load factor (BELF), RASM vs CASM gap, profit per flight and sensitivity. Useful for quick scenario checks in pricing, capacity planning and network development.

Total Seats

Stage Length (nm)

CASM (¢ per ASM)

Avg Base Fare (USD)

Ancillary per Pax (USD)

Fixed Cost per Flight (USD)

Projected Load Factor (%)

Per-Pax Taxes & Fees (USD)

Ready.

CASM entered in US cents per available seat mile; tool multiplies by stage length to get variable seat cost. Taxes reduce net contribution (exclude if pass-through).

Break-Even Load Factor

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RASM (Projected)

—

Passenger + ancillary / ASM

CASM (Input)

—

Operating cost / ASM

Profit per Flight

—

Revenue / Pax (Net)

—

Base + ancillary − taxes

Seat Cost (Stage)

—

CASM × stage length

Methodology

BELF formula here: Break-even LF = (Fixed Cost + Variable Cost per Seat × Seats) / (Net Revenue per Pax × Seats). Variable Cost per Seat = (CASM¢ /100) × Stage Length (miles). Net Revenue per Pax = Base Fare + Ancillary − Taxes (if taxes are non-contributory). Equivalent classic expression: BELF ≈ CASM / Yield (if fixed cost already embedded in CASM and yield excludes taxes).